As I said, the information isn’t readily available. the best I could get was “Tucked snugly in between Poundland and a duvet shop, the front door to Splash Damage’s Bromley studio…” from here: http://www.telegraph.co.uk/technology/video-games/8680850/Studio-profile-Splash-Damage.html
Speaking of which I can’t see the poundland or the duvet shop on the google maps link above.
So incidentally a quick update to the “Contact us” section of the website might be in order.